win32_time.c (2573B)
1 //======================================================================== 2 // GLFW 3.3 Win32 - www.glfw.org 3 //------------------------------------------------------------------------ 4 // Copyright (c) 2002-2006 Marcus Geelnard 5 // Copyright (c) 2006-2017 Camilla Löwy <elmindreda@glfw.org> 6 // 7 // This software is provided 'as-is', without any express or implied 8 // warranty. In no event will the authors be held liable for any damages 9 // arising from the use of this software. 10 // 11 // Permission is granted to anyone to use this software for any purpose, 12 // including commercial applications, and to alter it and redistribute it 13 // freely, subject to the following restrictions: 14 // 15 // 1. The origin of this software must not be misrepresented; you must not 16 // claim that you wrote the original software. If you use this software 17 // in a product, an acknowledgment in the product documentation would 18 // be appreciated but is not required. 19 // 20 // 2. Altered source versions must be plainly marked as such, and must not 21 // be misrepresented as being the original software. 22 // 23 // 3. This notice may not be removed or altered from any source 24 // distribution. 25 // 26 //======================================================================== 27 // Please use C89 style variable declarations in this file because VS 2010 28 //======================================================================== 29 30 #include "internal.h" 31 32 33 ////////////////////////////////////////////////////////////////////////// 34 ////// GLFW internal API ////// 35 ////////////////////////////////////////////////////////////////////////// 36 37 // Initialise timer 38 // 39 void _glfwInitTimerWin32(void) 40 { 41 uint64_t frequency; 42 43 if (QueryPerformanceFrequency((LARGE_INTEGER*) &frequency)) 44 { 45 _glfw.timer.win32.hasPC = GLFW_TRUE; 46 _glfw.timer.win32.frequency = frequency; 47 } 48 else 49 { 50 _glfw.timer.win32.hasPC = GLFW_FALSE; 51 _glfw.timer.win32.frequency = 1000; 52 } 53 } 54 55 56 ////////////////////////////////////////////////////////////////////////// 57 ////// GLFW platform API ////// 58 ////////////////////////////////////////////////////////////////////////// 59 60 uint64_t _glfwPlatformGetTimerValue(void) 61 { 62 if (_glfw.timer.win32.hasPC) 63 { 64 uint64_t value; 65 QueryPerformanceCounter((LARGE_INTEGER*) &value); 66 return value; 67 } 68 else 69 return (uint64_t) timeGetTime(); 70 } 71 72 uint64_t _glfwPlatformGetTimerFrequency(void) 73 { 74 return _glfw.timer.win32.frequency; 75 } 76